Exposure

• Amount of light allowed into the camera's sensor and how long the sensor is exposed to light while taking a photo
• Controlled with shutter speed or aperture
• Long exposure = slow shutter speed (star trails). Short exposure = fast shutter speed (high speed photography)
• Exposure combines: Aperture, shutter speed, and ISO/film speed (sensitivity of the sensor)
• All three elements have to work together to properly expose a photo. A change in one will change the others
• The higher the ISO, the more noise
• Large aperture needs quicker shutter speeds, smaller needs slower

Wide aperture

ISO

Slow shutter speed.